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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for L{twisted.logger._util}.
"""
from twisted.trial import unittest
from .._observer import LogPublisher
from .._util import formatTrace
class UtilTests(unittest.TestCase):
"""
Utility tests.
"""
def test_trace(self):
"""
Tracing keeps track of forwarding done by the publisher.
"""
publisher = LogPublisher()
event = dict(log_trace=[])
o1 = lambda e: None
def o2(e):
self.assertIs(e, event)
self.assertEqual(
e["log_trace"],
[
(publisher, o1),
(publisher, o2),
# Event hasn't been sent to o3 yet
]
)
def o3(e):
self.assertIs(e, event)
self.assertEqual(
e["log_trace"],
[
(publisher, o1),
(publisher, o2),
(publisher, o3),
]
)
publisher.addObserver(o1)
publisher.addObserver(o2)
publisher.addObserver(o3)
publisher(event)
def test_formatTrace(self):
"""
Format trace as string.
"""
event = dict(log_trace=[])
o1 = lambda e: None
o2 = lambda e: None
o3 = lambda e: None
o4 = lambda e: None
o5 = lambda e: None
o1.name = "root/o1"
o2.name = "root/p1/o2"
o3.name = "root/p1/o3"
o4.name = "root/p1/p2/o4"
o5.name = "root/o5"
def testObserver(e):
self.assertIs(e, event)
trace = formatTrace(e["log_trace"])
self.assertEqual(
trace,
(
u"{root} ({root.name})\n"
u" -> {o1} ({o1.name})\n"
u" -> {p1} ({p1.name})\n"
u" -> {o2} ({o2.name})\n"
u" -> {o3} ({o3.name})\n"
u" -> {p2} ({p2.name})\n"
u" -> {o4} ({o4.name})\n"
u" -> {o5} ({o5.name})\n"
u" -> {oTest}\n"
).format(
root=root,
o1=o1, o2=o2, o3=o3, o4=o4, o5=o5,
p1=p1, p2=p2,
oTest=oTest
)
)
oTest = testObserver
p2 = LogPublisher(o4)
p1 = LogPublisher(o2, o3, p2)
p2.name = "root/p1/p2/"
p1.name = "root/p1/"
root = LogPublisher(o1, p1, o5, oTest)
root.name = "root/"
root(event)
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